How to Disable / Enable USB Debugging on Android
The USB Debugging feature is not necessarily just for developers, rooting or flashing custom ROMs and you may need to enable USB Debugging on Android ...
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Google Nexus 4 second camera (Front camera) is mainly used for video chat. But if you want to use front camera on Nexus 4 in the camera application and take photos, follow the instruction
1. Open "Camera" app
2. Hold your finger on the screen to see Camera Settings
3. Move your finger to the Second camera icon
4. Second camera is now Active! (To change to the main camera, do the steps again)